Inflated grinding wheel



Jan. 27, 1959 A. RASKE 2,870,582

INFLATED GRINDING WHEEL Filed Oct. 2, 195a INVENTOR.

ARTHUR RASKE /M M*W/ Iu ATTORNEYS United States Patent O INFLATEDGRINDING WHEEL Arthur Raske, Willoughby, Ohio Application October 2,1956, SerialNo. 613,574

4 Claims. (01; 51-192 My inventionrelates too. new anduseful improvementin an inflatedgrinding wheel so constructed and arranged that thesupporting body of the wheel on which the abrasive. material is to bemounted may be inflated so as to securely bind the circular band. ofabrasive mate= rial which embraces the same.

It is an object of the present'invention to provide a grinding Wheel ofthis class which will be simple in con struction, economical ofmanufacture, durable, compact, easily and quickly assembled, and highlyefilcient in use.

Another objectof the invention is to provide a grinding wheel. of thisclass so constructed and arranged that improved concentricity at theperiphery of the wheel is accomplished;

Another object of the. invention is the provision of a wheelv of ,thisclass so-constructed and arranged that an improved. air seal between theinflated body'and 'the rigid core is accomplished soth-at the-internalpressure applied through the air valve will force the inflated embracingmember into proper relationship totherigid core without additionalprocesses.

Another object of the invention is the provision of a grindingwheel ofthistype so constructed 'that no axial pressures are exerted upon thecore member.

Another object of the invention is the provision of a grinding wheel ofthis type having a rigid core: member provided with inwardly directedthreaded passages for reception of the valve stem, thus eliminatingthenecessity of a special valve housing,

Another object of the invention is the. provision offja grinding Wheelof this class so constructed and;arrang. ed that it may be economicallymanufactured due to the fact that the rigid core may remain constant forvarious diameters of inflated drums or parts.

Another object of the invention is to provision in a grinding Wheel ofthis class of a drum or inflatable annular member so constructed andarranged that a stable balanced wheel will be provided and the drum orinflatable member will be prevented from flying oil of the rigid core.

Other objects will appear hereinafter.

It is recognized that various modifications and changes may be made inthe detail of structure illustrated without departing from the inventionand it is intended that the present disclosure shall be considered to bebut the preferred embodiment.

Forming a part of this application are drawings in which:

Fig. 1 is an end elevational view of the invention;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1; p

Fig. 3 is a fragmentary enlarged sectional View taken on the line 33 ofFig. 2, showing the valve in closed position;

Fig. 4 is a view similar to Fig. 3, but showing the valve in openposition.

2,870,582 Patented Jan- 27,1959

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As; shown in the drawings, the invention: comprises a rigid coreL7; madefromanysuitable materialand'pref erably of; metaL- I have. found that.it is an advantage to constructthis core from alight metal, such asaluminum. This corez7 has a. threaded bore 8 formed-therethroughextending from end to end. At theopposite ends of the core 7 is aninwardly directed flange-9 to provide acircular groove10tTheop-positeend faces'of thecore-arecounter-bored inwardly as'at 11-;Formed in..one. of the end:- faces of the core- 7, at the inwardly boredportion 11 is a threaded passage 12 in whichv is threaded. a shell or:housing 13, through which slid-ably projects-a valve stem 14 carryingat. its inner'end" the valve head. 15 :which, when.: the valve is inclosed position, will. engage against the end of theshell 13 andelfectanair seaL.

Embracing. the stem 14 is a coil spring 16 which bears atone enduagainstthe. reduced end of the shell 13 and atits opposite' end against thecollar 17' formed onthe valve-stem 14.. Theconstruction of this valve issimilar to' that used.on vehicle tires and will sometimes be re ferredto. herein as a tire valve. The shell 13 opens at its inner end into thepassage 18 communicating with the lateral passage 19.

An inflatable drum isused with this mechanism and comprises an annular.member'having the periphery forming-member 20 and the side Walls 21 and2-2 which are inclinedv to. the periphery. 2.0. I Each of these sidewalls is providedwitha head" 23 embodying a flange 24 whicli is adaptedto snugly engage in the groove 10. The in-'' nerifaceofthis head engagesfirmly against the periphery 26 of the rigid core: 7. It will be notedthat'thi's head extends outwardly of the flange 9 so as to' fill thegroove 10,. and. also. extends'inwardly from thisflange' adis' tance sothat the'heads on the opposite side-walls 21 and 22 project inwardlytoward each other but are. spaced apart. At. the. space separating theopposed ends 05 this .head, the passage 19 is located.

11151156, the inflatable drum is embraced' by an endless band:25- of.suitable abrasiveor grinding =material l may be forced under pressureinto the interior of tlie inflatable drum, through. the valve, andthrough are passages 18-and519', so as to force theperiphery 2W of thisinflatabIedrum outwardly into tight engagement with the 'encirclingba'nd.25 of abrasive material.

A threadedbores may bemade-a. proper; 'sizestor recei virig a powerspindle which will serve to rotate the grinding wheel when in use.

It will be noted that as the air is forced into the inflatable drum, theair pressure will move the various parts into assembled relation to therigid core 7. Due to the large supporting area at the heads 23, theconcentricity of the periphery 20 is improved.

Experience has shown that the core member is possessed of a greater lifebecause there are no pressure exerting members directing the pressureaxially of the core, as is common in inflatable grinding Wheels.

Experience has also shown that this type of grinding wheel structure ismore readily and cheaply manufactured in special sizes than otherinflated wheels presently on the market because of the lack of specialtooling and molds required for any part except the drum. It is, ofcourse, obvious that for a core 7 of a certain size, the dimensions ofthe drum can be varied only diametrically as the heads 23 and theflanges 24 would remain the same.

What I claim is:

1. In an inflated grinding Wheel of the class described comprising: arigid solid core having a threaded opening formed centrally therethroughand provided on its periphery, at opposite ends, with parallel flatfaces, and

provided on its periphery, at each opposite end, with an inwardlydirected flange to provide oppositely disposed peripheral grooves, theinner surface of each of said flanges being in alignment and parallel tothe axis of said core; an inflatable, flexible drum comprisingtanannular trough-shaped band having sides inclined inwardly toward eachother embracingsaid core;.a head on the end of each of said sides, eachof said heads having an outwardly projecting flange for engaging betweensaid core and the inwardly directed flange on said core, said flanges onsaid head having on their inner and outer surfaces :1 surface parallelto the axis of said drum.

2. In an inflated grinding wheel of the class described comprising: arigid solid core having a threaded opening formed centrally therethroughand provided on its periphery, at oppoiste ends, with parallel flatfaces, and provided on its periphery, at each opposite end, with aninwardly directed flange to provide oppositely disposed peripheralgrooves, the inner surface of each of said flanges being in alignmentand parallel to the axis of said core; an inflatable, flexible drumcomprising an annular trough-shaped band having sides inclined inwardlytoward each other embracing said core; a head on the end each of saidsides, each of said heads having an outwardly projecting flange forengaging between said core and the inwardly directed flange on saidcore, said flanges on said head having on their inner and outer surfacesat surface parallel to the axis of said drum; said heads lying in snugengagement with the periphery of said core and the outer surfaces of theflanges on said heads lying snugly in engagement with the inner surfacesof said core; said heads terminating in spaced relation at adjacentsides to provide a passage therebetween.

.3. In an inflated grinding wheel of the class described comprising: arigid solid core having a threaded opening formed centrally therethroughand provided on its periphery, at opposite ends, with parallel flatfaces, and provided on its periphery, at each opposite end, with aninwardly directed flange to provide oppositely disposed peripheralgrooves, the inner surface of each of ,said flanges being in alignmentand parallel tothe axis of said1 cdre; an inflatable, flexible drumcomprising an annular trough-shaped band having sidesinclined inwardlytoward each other embracing said core; a head on the end ,of each ofsaid sides, each of said heads having an outwardly projecting flange forengaging between said core and the inwardly directed flange on saidcore, said" flanges on said head having on their inner and outersurfaces 8. surface parallel to the axis of said drum;

said heads lying in snug engagement with the periphery i an inwardlydirected flange to provide oppositely dis of said core and the outersurfaces of the flanges on said heads lying snugly in engagement withthe inner surfaces of said core; said heads terminating in spacedrelation at adjacent sides to provide a passage therebetween; said corehaving projecting inwardly from one of its side faces an axiallydirected passage communicating a radially directed passage with theinterior of said drum through the space between the opposed faces ofsaid heads. a

4. In an inflated grindingwheel of. the class described comprising: arigid solid core having a threaded opening formed centrally therethroughand provided on its periphery, at opposite ends, with parallel flatfaces, and provided on its periphery, at each opposite end, with posedperipheral grooves, the inner surface of each of said flanges being inalignment and parallel to the axis of said core; an inflatable, flexibledrum comprising an annular trough-shaped b-and having sides inclinedinwardly. toward each other embracing said core; a head on the end ofeach of said sides, each of said heads having an outwardly projectingflange for engaging between said 1 said heads lying in snug engagementwith the periphery" core and the inwardly directed flange on said core,said flanges on said head, having on their inner and outer surfaces asurface parallel to the axis of said drum;

of said core and the outer surfaces of the flanges on said heads lyingsnugly in engagement with the inner surfaces of said core; said headsterminating in spaced relation at adjacent sides to provide a passagetherebe 3 tween; said core having projecting inwardly from one of itsside faces an axially directed passage communicating a radially directedpassage with the interior of said drum through the space between theopposed faces of said heads; and an air valve mounted in said axiallydirected passage in said core at the outer end of said passage forpermitting the flow of air under pressure therethrough into the interiorof said drum and preventing the flow of air under pressure outwardlythereof.

References Cited in the file of this patent UNITED STATES PATENTS

